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# Mr. x has taken r test and has average of 80%. What must get

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Manager
Joined: 25 Feb 2008
Posts: 53

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Mr. x has taken r test and has average of 80%. What must get [#permalink]

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11 Mar 2008, 08:02
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Mr. x has taken r test and has average of 80%. What must get on the next test to acheive an average of 82%?

2r+82
2r+80
r+82
2r-80
2r-82

thanks

Kudos [?]: 14 [0], given: 0

SVP
Joined: 24 Aug 2006
Posts: 2130

Kudos [?]: 152 [0], given: 0

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11 Mar 2008, 08:16
Capthan wrote:
Mr. x has taken r test and has average of 80%. What must get on the next test to acheive an average of 82%?

2r+82
2r+80
r+82
2r-80
2r-82

thanks

let x = next test score

(80r + x)/(r+1) = 82

solve for x

Kudos [?]: 152 [0], given: 0

Re: Average   [#permalink] 11 Mar 2008, 08:16
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